Client Server r0.6.0

Breaking Changes

• Add id_access_token as a required request parameter to a few
  endpoints which require an id_server parameter as part of
  MSC2140.
  (#2255)

New Endpoints

• Add POST /account/3pid/unbind for removing a 3PID from an identity
  server.
  (#2282)

Backwards Compatible Changes

• Add M_USER_DEACTIVATED error code.
  (#2234)
• Remove bind_msisdn and bind_email from /register now that the
  identity server's bind endpoint requires authentication.
  (#2279)
• Add m.identity_server account data for tracking the user's
  preferred identity server.
  (#2281)
• Deprecate id_server and make it optional in several places.
  (#2310)

Spec Clarifications

• Add missing format fields to m.room.message$m.notice schema.
  (#2125)
• Remove "required" designation from the url field of certain
  m.room.message msgtypes.
  (#2129)
• Fix various typos throughout the specification.
  (#2131,
  #2136,
  #2148,
  #2215)
• Clarify the distinction between m.key.verification.start and its
  m.sas.v1 variant.
  (#2132)
• Fix link to Olm signing specification.
  (#2133)
• Clarify the conditions for the .m.rule.room_one_to_one push rule.
  (#2152)
• Clarify the encryption algorithms supported by the device of the
  device keys example.
  (#2157)
• Clarify that /rooms/:roomId/event/:eventId returns a Matrix error.
  (#2204)
• Add a missing state_key check on .m.rule.tombstone.
  (#2223)
• Fix the m.room_key_request action value, setting it from
  cancel_request to request_cancellation.
  (#2247)
• Clarify that the submit_url field is without authentication.
  (#2341)
• Clarify the expected phone number format.
  (#2342)
• Clarify that clients should consider not requesting URL previews in
  encrypted rooms.
  (#2343)
• Add missing information on how filters are meant to work with
  /context.
  (#2344)
• Clarify what the keys are for rooms in /sync.
  (#2345)